1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem. 4 * 5 * Changes: 6 * YOSHIFUJI Hideaki @USAGI: added icmp sysctl table. 7 */ 8 9 #include <linux/mm.h> 10 #include <linux/sysctl.h> 11 #include <linux/in6.h> 12 #include <linux/ipv6.h> 13 #include <linux/slab.h> 14 #include <linux/export.h> 15 #include <net/ndisc.h> 16 #include <net/ipv6.h> 17 #include <net/addrconf.h> 18 #include <net/inet_frag.h> 19 #include <net/netevent.h> 20 #ifdef CONFIG_NETLABEL 21 #include <net/calipso.h> 22 #endif 23 24 static int zero; 25 static int one = 1; 26 static int auto_flowlabels_min; 27 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX; 28 29 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write, 30 void __user *buffer, size_t *lenp, 31 loff_t *ppos) 32 { 33 struct net *net; 34 int ret; 35 36 net = container_of(table->data, struct net, 37 ipv6.sysctl.multipath_hash_policy); 38 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 39 if (write && ret == 0) 40 call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net); 41 42 return ret; 43 } 44 45 static struct ctl_table ipv6_table_template[] = { 46 { 47 .procname = "bindv6only", 48 .data = &init_net.ipv6.sysctl.bindv6only, 49 .maxlen = sizeof(int), 50 .mode = 0644, 51 .proc_handler = proc_dointvec 52 }, 53 { 54 .procname = "anycast_src_echo_reply", 55 .data = &init_net.ipv6.sysctl.anycast_src_echo_reply, 56 .maxlen = sizeof(int), 57 .mode = 0644, 58 .proc_handler = proc_dointvec 59 }, 60 { 61 .procname = "flowlabel_consistency", 62 .data = &init_net.ipv6.sysctl.flowlabel_consistency, 63 .maxlen = sizeof(int), 64 .mode = 0644, 65 .proc_handler = proc_dointvec 66 }, 67 { 68 .procname = "auto_flowlabels", 69 .data = &init_net.ipv6.sysctl.auto_flowlabels, 70 .maxlen = sizeof(int), 71 .mode = 0644, 72 .proc_handler = proc_dointvec_minmax, 73 .extra1 = &auto_flowlabels_min, 74 .extra2 = &auto_flowlabels_max 75 }, 76 { 77 .procname = "fwmark_reflect", 78 .data = &init_net.ipv6.sysctl.fwmark_reflect, 79 .maxlen = sizeof(int), 80 .mode = 0644, 81 .proc_handler = proc_dointvec 82 }, 83 { 84 .procname = "idgen_retries", 85 .data = &init_net.ipv6.sysctl.idgen_retries, 86 .maxlen = sizeof(int), 87 .mode = 0644, 88 .proc_handler = proc_dointvec, 89 }, 90 { 91 .procname = "idgen_delay", 92 .data = &init_net.ipv6.sysctl.idgen_delay, 93 .maxlen = sizeof(int), 94 .mode = 0644, 95 .proc_handler = proc_dointvec_jiffies, 96 }, 97 { 98 .procname = "flowlabel_state_ranges", 99 .data = &init_net.ipv6.sysctl.flowlabel_state_ranges, 100 .maxlen = sizeof(int), 101 .mode = 0644, 102 .proc_handler = proc_dointvec 103 }, 104 { 105 .procname = "ip_nonlocal_bind", 106 .data = &init_net.ipv6.sysctl.ip_nonlocal_bind, 107 .maxlen = sizeof(int), 108 .mode = 0644, 109 .proc_handler = proc_dointvec 110 }, 111 { 112 .procname = "flowlabel_reflect", 113 .data = &init_net.ipv6.sysctl.flowlabel_reflect, 114 .maxlen = sizeof(int), 115 .mode = 0644, 116 .proc_handler = proc_dointvec, 117 }, 118 { 119 .procname = "max_dst_opts_number", 120 .data = &init_net.ipv6.sysctl.max_dst_opts_cnt, 121 .maxlen = sizeof(int), 122 .mode = 0644, 123 .proc_handler = proc_dointvec 124 }, 125 { 126 .procname = "max_hbh_opts_number", 127 .data = &init_net.ipv6.sysctl.max_hbh_opts_cnt, 128 .maxlen = sizeof(int), 129 .mode = 0644, 130 .proc_handler = proc_dointvec 131 }, 132 { 133 .procname = "max_dst_opts_length", 134 .data = &init_net.ipv6.sysctl.max_dst_opts_len, 135 .maxlen = sizeof(int), 136 .mode = 0644, 137 .proc_handler = proc_dointvec 138 }, 139 { 140 .procname = "max_hbh_length", 141 .data = &init_net.ipv6.sysctl.max_hbh_opts_len, 142 .maxlen = sizeof(int), 143 .mode = 0644, 144 .proc_handler = proc_dointvec 145 }, 146 { 147 .procname = "fib_multipath_hash_policy", 148 .data = &init_net.ipv6.sysctl.multipath_hash_policy, 149 .maxlen = sizeof(int), 150 .mode = 0644, 151 .proc_handler = proc_rt6_multipath_hash_policy, 152 .extra1 = &zero, 153 .extra2 = &one, 154 }, 155 { 156 .procname = "seg6_flowlabel", 157 .data = &init_net.ipv6.sysctl.seg6_flowlabel, 158 .maxlen = sizeof(int), 159 .mode = 0644, 160 .proc_handler = proc_dointvec 161 }, 162 { } 163 }; 164 165 static struct ctl_table ipv6_rotable[] = { 166 { 167 .procname = "mld_max_msf", 168 .data = &sysctl_mld_max_msf, 169 .maxlen = sizeof(int), 170 .mode = 0644, 171 .proc_handler = proc_dointvec 172 }, 173 { 174 .procname = "mld_qrv", 175 .data = &sysctl_mld_qrv, 176 .maxlen = sizeof(int), 177 .mode = 0644, 178 .proc_handler = proc_dointvec_minmax, 179 .extra1 = &one 180 }, 181 #ifdef CONFIG_NETLABEL 182 { 183 .procname = "calipso_cache_enable", 184 .data = &calipso_cache_enabled, 185 .maxlen = sizeof(int), 186 .mode = 0644, 187 .proc_handler = proc_dointvec, 188 }, 189 { 190 .procname = "calipso_cache_bucket_size", 191 .data = &calipso_cache_bucketsize, 192 .maxlen = sizeof(int), 193 .mode = 0644, 194 .proc_handler = proc_dointvec, 195 }, 196 #endif /* CONFIG_NETLABEL */ 197 { } 198 }; 199 200 static int __net_init ipv6_sysctl_net_init(struct net *net) 201 { 202 struct ctl_table *ipv6_table; 203 struct ctl_table *ipv6_route_table; 204 struct ctl_table *ipv6_icmp_table; 205 int err; 206 207 err = -ENOMEM; 208 ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template), 209 GFP_KERNEL); 210 if (!ipv6_table) 211 goto out; 212 ipv6_table[0].data = &net->ipv6.sysctl.bindv6only; 213 ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply; 214 ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency; 215 ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels; 216 ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect; 217 ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries; 218 ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay; 219 ipv6_table[7].data = &net->ipv6.sysctl.flowlabel_state_ranges; 220 ipv6_table[8].data = &net->ipv6.sysctl.ip_nonlocal_bind; 221 ipv6_table[9].data = &net->ipv6.sysctl.flowlabel_reflect; 222 ipv6_table[10].data = &net->ipv6.sysctl.max_dst_opts_cnt; 223 ipv6_table[11].data = &net->ipv6.sysctl.max_hbh_opts_cnt; 224 ipv6_table[12].data = &net->ipv6.sysctl.max_dst_opts_len; 225 ipv6_table[13].data = &net->ipv6.sysctl.max_hbh_opts_len; 226 ipv6_table[14].data = &net->ipv6.sysctl.multipath_hash_policy, 227 ipv6_table[15].data = &net->ipv6.sysctl.seg6_flowlabel; 228 229 ipv6_route_table = ipv6_route_sysctl_init(net); 230 if (!ipv6_route_table) 231 goto out_ipv6_table; 232 233 ipv6_icmp_table = ipv6_icmp_sysctl_init(net); 234 if (!ipv6_icmp_table) 235 goto out_ipv6_route_table; 236 237 net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table); 238 if (!net->ipv6.sysctl.hdr) 239 goto out_ipv6_icmp_table; 240 241 net->ipv6.sysctl.route_hdr = 242 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table); 243 if (!net->ipv6.sysctl.route_hdr) 244 goto out_unregister_ipv6_table; 245 246 net->ipv6.sysctl.icmp_hdr = 247 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table); 248 if (!net->ipv6.sysctl.icmp_hdr) 249 goto out_unregister_route_table; 250 251 err = 0; 252 out: 253 return err; 254 out_unregister_route_table: 255 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 256 out_unregister_ipv6_table: 257 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 258 out_ipv6_icmp_table: 259 kfree(ipv6_icmp_table); 260 out_ipv6_route_table: 261 kfree(ipv6_route_table); 262 out_ipv6_table: 263 kfree(ipv6_table); 264 goto out; 265 } 266 267 static void __net_exit ipv6_sysctl_net_exit(struct net *net) 268 { 269 struct ctl_table *ipv6_table; 270 struct ctl_table *ipv6_route_table; 271 struct ctl_table *ipv6_icmp_table; 272 273 ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg; 274 ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg; 275 ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg; 276 277 unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr); 278 unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr); 279 unregister_net_sysctl_table(net->ipv6.sysctl.hdr); 280 281 kfree(ipv6_table); 282 kfree(ipv6_route_table); 283 kfree(ipv6_icmp_table); 284 } 285 286 static struct pernet_operations ipv6_sysctl_net_ops = { 287 .init = ipv6_sysctl_net_init, 288 .exit = ipv6_sysctl_net_exit, 289 }; 290 291 static struct ctl_table_header *ip6_header; 292 293 int ipv6_sysctl_register(void) 294 { 295 int err = -ENOMEM; 296 297 ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable); 298 if (!ip6_header) 299 goto out; 300 301 err = register_pernet_subsys(&ipv6_sysctl_net_ops); 302 if (err) 303 goto err_pernet; 304 out: 305 return err; 306 307 err_pernet: 308 unregister_net_sysctl_table(ip6_header); 309 goto out; 310 } 311 312 void ipv6_sysctl_unregister(void) 313 { 314 unregister_net_sysctl_table(ip6_header); 315 unregister_pernet_subsys(&ipv6_sysctl_net_ops); 316 } 317